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The high-level knowledge that no autocomplete can replace. Pick a domain and go deep.

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System Design

Trade-offs, architecture patterns, and the decisions that shape how software behaves at scale.

Distributed Systems

Consensus, replication, partitioning — the hard problems of coordination across machines.

Observability

Logs, metrics, traces, and the practice of making opaque systems transparent.

Data Visualization

Turning numbers into narratives with the right visual encodings and tools.

Testing

Confidence through verification — from unit tests to chaos engineering.

Security

Defence in depth. Understanding the attack surface of modern web applications.

Performance

Profiling, optimizing, and measuring — making systems fast where it matters.

HTTP

The protocol that runs the web, from request-response basics to HTTP/3.

Databases

Where state lives. Choosing, tuning, and understanding data stores.

Topics